[bug #59911] Problem with qagui 1D integrator

[Patrick Alken]

URL:
  <https://savannah.gnu.org/bugs/?59911>

                 Summary: Problem with qagui 1D integrator
                 Project: GNU Scientific Library
            Submitted by: psa
            Submitted on: Wed 20 Jan 2021 02:36:50 AM UTC
                Category: None
                Severity: 3 - Normal
        Operating System: 
                  Status: None
             Assigned to: None
             Open/Closed: Open
                 Release: 
         Discussion Lock: Any

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Details:

from takacs =dot= adam =at= wigner =dot= mta =dot= hu

Dear GSL Helpers,

We tried to use the qagiu algorithm to calculate the following integration

   \int_0^infty dx cosh(x) e^{-cosh(x)} ,

however qagiu falls and complains on "bad integrand behavior". If we're
using qags with a fixed big upper limit, the integral is fine.

Do you have any suggestion what could be the problem? We'd like to
use qagiu without upper limit.




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